import { Test, TestingModule } from '@nestjs/testing';
import { getRepositoryToken } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { SyncService, ImportUserDto } from './sync.service';
import { SyncLog, SyncState, UserDingMapping } from '../entities';
import { User } from '../entities/user.entity';
import { Student } from '../entities/student.entity';
import { Role } from '../entities/role.entity';
import { DingTalkService } from '../integration/dingtalk.service';
import { WeComService } from '../integration/wecom.service';
import { AttendanceImportService } from '../attendance/attendance-import.service';
import { ScheduleSyncService } from './schedule-sync.service';

describe('SyncService — new methods', () => {
  let service: SyncService;

  let mappingRepo: jest.Mocked<
    Pick<Repository<UserDingMapping>, 'findOne' | 'create' | 'save' | 'find'>
  >;
  let userRepo: jest.Mocked<Pick<Repository<User>, 'create' | 'save'>>;
  let studentRepo: jest.Mocked<Pick<Repository<Student>, 'create' | 'save'>>;
  let roleRepo: jest.Mocked<Pick<Repository<Role>, 'findOne'>>;

  let dingTalkService: jest.Mocked<Pick<DingTalkService, 'fetchOrgTreeWithUsers' | 'syncAll' | 'fetchOrgTree'>>;

  beforeEach(async () => {
    mappingRepo = {
      findOne: jest.fn(),
      create: jest.fn(),
      save: jest.fn(),
      find: jest.fn().mockResolvedValue([]),
    };

    userRepo = {
      create: jest.fn(),
      save: jest.fn(),
    };

    studentRepo = {
      create: jest.fn(),
      save: jest.fn(),
    };

    roleRepo = {
      findOne: jest.fn(),
    };

    dingTalkService = {
      fetchOrgTreeWithUsers: jest.fn(),
      syncAll: jest.fn(),
      fetchOrgTree: jest.fn(),
    };

    const mockWeComService = { syncAll: jest.fn() };
    const mockAttendanceImportService = { importFromDingTalk: jest.fn() };
    const mockScheduleSyncService = { syncAll: jest.fn(), getStatus: jest.fn() };

    const module: TestingModule = await Test.createTestingModule({
      providers: [
        SyncService,
        { provide: getRepositoryToken(SyncLog), useValue: { create: jest.fn(), save: jest.fn(), find: jest.fn(), findOne: jest.fn() } },
        { provide: getRepositoryToken(SyncState), useValue: { findOne: jest.fn(), upsert: jest.fn() } },
        { provide: getRepositoryToken(UserDingMapping), useValue: mappingRepo },
        { provide: getRepositoryToken(User), useValue: userRepo },
        { provide: getRepositoryToken(Student), useValue: studentRepo },
        { provide: getRepositoryToken(Role), useValue: roleRepo },
        { provide: DingTalkService, useValue: dingTalkService },
        { provide: WeComService, useValue: mockWeComService },
        { provide: AttendanceImportService, useValue: mockAttendanceImportService },
        { provide: ScheduleSyncService, useValue: mockScheduleSyncService },
      ],
    }).compile();

    service = module.get<SyncService>(SyncService);
  });

  // ── getDingTalkOrgTreeWithUsers ──

  it('getDingTalkOrgTreeWithUsers delegates to dingTalkService.fetchOrgTreeWithUsers', async () => {
    const mockTree = [{ id: 1, name: 'root', parentId: 0, children: [], users: [] }];
    dingTalkService.fetchOrgTreeWithUsers.mockResolvedValue(mockTree);

    const result = await service.getDingTalkOrgTreeWithUsers(1);

    expect(dingTalkService.fetchOrgTreeWithUsers).toHaveBeenCalledWith(1);
    expect(result).toBe(mockTree);
  });

  // ── importDingTalkUsers ──

  it('imports teacher when roleId is a number (role found)', async () => {
    const mockRole = { id: 5, name: 'Teacher' } as Role;
    roleRepo.findOne.mockResolvedValue(mockRole);

    const mockUser = { id: 10 } as User;
    userRepo.create.mockReturnValue(mockUser);
    userRepo.save.mockResolvedValue(mockUser);

    mappingRepo.findOne.mockResolvedValue(null);
    mappingRepo.create.mockReturnValue({} as UserDingMapping);
    mappingRepo.save.mockResolvedValue({} as UserDingMapping);

    const users: ImportUserDto[] = [
      { dingUserId: 'user1', name: 'Zhang San', mobile: '13800001111', roleId: 5 },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.teacherCount).toBe(1);
    expect(result.studentCount).toBe(0);
    expect(result.skipped).toBe(0);

    expect(roleRepo.findOne).toHaveBeenCalledWith({ where: { id: 5 } });
    expect(userRepo.save).toHaveBeenCalledWith(
      expect.objectContaining({ roles: [mockRole] }),
    );
  });

  it('imports teacher when roleId is a number but role not found (logs warning, no roles assigned)', async () => {
    roleRepo.findOne.mockResolvedValue(null);

    const mockUser = { id: 11 } as User;
    userRepo.create.mockReturnValue(mockUser);
    userRepo.save.mockResolvedValue(mockUser);

    mappingRepo.findOne.mockResolvedValue(null);
    mappingRepo.create.mockReturnValue({} as UserDingMapping);
    mappingRepo.save.mockResolvedValue({} as UserDingMapping);

    const users: ImportUserDto[] = [
      { dingUserId: 'user2', name: 'Li Si', mobile: '13800002222', roleId: 999 },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.teacherCount).toBe(1);
    expect(result.studentCount).toBe(0);
    expect(result.skipped).toBe(0);

    // User should be saved once (without roles assignment the second time)
    expect(userRepo.save).toHaveBeenCalledTimes(1);
  });

  it('imports student when roleId is null', async () => {
    const mockUser = { id: 20 } as User;
    userRepo.create.mockReturnValue(mockUser);
    userRepo.save.mockResolvedValue(mockUser);

    const mockStudent = { id: 30 } as Student;
    studentRepo.create.mockReturnValue(mockStudent);
    studentRepo.save.mockResolvedValue(mockStudent);

    mappingRepo.findOne.mockResolvedValue(null);
    mappingRepo.create.mockReturnValue({} as UserDingMapping);
    mappingRepo.save.mockResolvedValue({} as UserDingMapping);

    const users: ImportUserDto[] = [
      { dingUserId: 'user3', name: 'Wang Wu', mobile: '', roleId: null },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.studentCount).toBe(1);
    expect(result.teacherCount).toBe(0);
    expect(result.skipped).toBe(0);

    expect(studentRepo.create).toHaveBeenCalledWith(
      expect.objectContaining({
        name: 'Wang Wu',
        userId: 20,
        status: 'active',
      }),
    );
    expect(studentRepo.save).toHaveBeenCalled();
  });

  it('skips user when mapping already exists', async () => {
    mappingRepo.findOne.mockResolvedValue({ id: 1 } as UserDingMapping);

    const users: ImportUserDto[] = [
      { dingUserId: 'existing', name: 'Zhao Liu', mobile: '13800003333', roleId: null },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.skipped).toBe(1);
    expect(result.teacherCount).toBe(0);
    expect(result.studentCount).toBe(0);
    expect(userRepo.create).not.toHaveBeenCalled();
  });

  it('handles per-user errors gracefully — one failure does not block others', async () => {
    // First user fails, second succeeds
    mappingRepo.findOne.mockResolvedValue(null);
    mappingRepo.create.mockReturnValue({} as UserDingMapping);
    mappingRepo.save.mockResolvedValue({} as UserDingMapping);

    userRepo.create
      .mockReturnValueOnce(new Error('DB error') as unknown as User)
      .mockReturnValueOnce({ id: 40 } as User);

    userRepo.save
      .mockRejectedValueOnce(new Error('DB error'))
      .mockResolvedValueOnce({ id: 40 } as User);

    studentRepo.create.mockReturnValue({} as Student);
    studentRepo.save.mockResolvedValue({} as Student);

    const users: ImportUserDto[] = [
      { dingUserId: 'fail', name: 'Fail User', mobile: '', roleId: null },
      { dingUserId: 'ok', name: 'Ok User', mobile: '', roleId: null },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.studentCount).toBe(1);
    expect(result.skipped).toBe(0);

    // The first user's mapping should not be saved, but the second's should
    expect(mappingRepo.save).toHaveBeenCalledTimes(1);
  });

  it('counts mixed teacher/student/skipped correctly', async () => {
    const mockRole = { id: 1, name: 'Teacher Role' } as Role;
    roleRepo.findOne.mockResolvedValue(mockRole);

    const mockUser = { id: 50 } as User;
    userRepo.create.mockReturnValue(mockUser);
    userRepo.save.mockResolvedValue(mockUser);

    studentRepo.create.mockReturnValue({} as Student);
    studentRepo.save.mockResolvedValue({} as Student);

    mappingRepo.create.mockReturnValue({} as UserDingMapping);
    mappingRepo.save.mockResolvedValue({} as UserDingMapping);

    // First: skip (existing), second: teacher, third: student
    mappingRepo.findOne
      .mockResolvedValueOnce({ id: 99 } as UserDingMapping) // skip
      .mockResolvedValueOnce(null) // teacher
      .mockResolvedValueOnce(null); // student

    const users: ImportUserDto[] = [
      { dingUserId: 'skip', name: 'Skip', mobile: '138', roleId: null },
      { dingUserId: 'teacher', name: 'Teacher', mobile: '139', roleId: 1 },
      { dingUserId: 'student', name: 'Student', mobile: '', roleId: null },
    ];

    const result = await service.importDingTalkUsers(users);

    expect(result.teacherCount).toBe(1);
    expect(result.studentCount).toBe(1);
    expect(result.skipped).toBe(1);
  });
});